Blank-holding means



3 Sheets-Sheet 2 Filed Dec. 6; 1924 R. E. SERVIS ET AL BLANK HOLDINGMEANS Aug 18, 1925 redaoowfoade,

Aug. 18, 1925.

Filed Dec. 6, 1924 R. E. SERVIS ET AL BLANK HOLDING'MEANS 3 Sheets-Sheet5 Even/Mfg flaa chlliocte an I .Y

Patented Aug. 18, 1925.

UNITED STATES PATENT OFFICE.

RAYMOND E. SERVIS AND FRIEDRICH J. RODE, OF CHICAGO, ILLINOIS, ASSIGNORSTO MABQUETTE TOOL & MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

BLANK-HOLDING MEANS.

Application filed December 6, 1924. Serial No. 754,349.

To all whom it may concern:

Be it known that we, RAYMOND E. SERVIS and FREDRICH J. Roma, citizens ofthe United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements inBlank-Holding Means, of which the following is a specification.

This invention relates to spring pressure cushions for use in drawing inone operation, metal shapes or shells of a greater depth than isordinarily possible to draw in one operation, and is particularlyadapted though not necessarily limited in its use in connection withwhat is termed a single action mechanical press.

In presses of this character there is provided a plurality of draw ringsor blank holding means which co-operate with the die, the blank beingheld between the draw ring or blank holding means and the ram during theforming or the shaping of the article. These draw rings are usuallyarranged one within the other, one of the rings being held by springpressure, against operation while the other ring is moved during thefirst portion of the cycle of operation of forming or shaping the blankover the stationary die and over the other die ring.

After the completion of the first portion of th cycle of operation informing or shaping tie article and during the same strokeof the ram, thearticle is further shaped over the stationary die, the inner draw ringbeing then moved against the spring pressure acting thereupon.

The fluid pressure upon the inner draw ring must of necessity be of sucha degree that the ring will not be moyedduring the first portion of theformation of the article, with the result that during that portion ofthe cycle of operation of the press in which the inner draw ring ismoved, the ram must overcome the excess spring pressure to complete theformation or shaping of the article. This results in a strain upon thecrank shaft and clutches and reduces the capacity orscope of the press.

It is one of the objects of the present invention to overcome theseditliculties and objections and to provide improved means to positivelylock in a fixed position one of the blank holding members or draw ringswhile i the other member or'blank holding means is allowed to remainmovable under the action of the ram, and to provide improved means forunlocking or releasing the locked member to allow it to move at apredetermined point or time in the cycle of operation of the press.

A further object is to provide improved means operating automatically tolock one of the blank holding means against move ment and toautomatically unlock or release the blank holding means for movement.

To the attainment of these ends and the accomplishment of other new anduseful objects as will appear, the invention consists in the features ofnovelty in substantially the construction, combination and arrangementof the several parts hereinafter more fully described and claimed andshown in the accompanying drawings illustrating this invention, and inwhich Figure 1 is a vertical longitudinal sec- Figure 3 is a detailview, partly in section and partly in elevation taken on line 3-3,Figures 1 and 3.

Figure 4 is a detail horizontal sectional view taken on line 44, Figure1.

Referring more particularly to the drawings the numeral 10 designatesthe bolster plate of a press, having mounted thereupon a stationary diemember 11, with which a cutting member 12 co-operates.

(Jo-operating with the die is another die member 13, carried by the ramor a movable part of the press, and this die member 13 co-operates withthe member 12 to cut or shear the material 14 and is so shaped that itwill pass between the dies 11 and 12 to shape the material over the die11, all in a. manner as well known in this art.

Encompassing the die 11 are a plurality of draw rings or blank holdingmembers 1516, one arranged within the other, and these members 15 and 16are respectively supported by means of pins 17 and 18 that pass looselythrough the bed or bolster plate 10.

Figure l Supported below the bolster plate 10 is a spring cushioningdevice, which is supported preferably by means of a bolt or member 19secured by one extremity to the bed or bolster plate 10. Supported bythe other extremity of the bolt 19 is a plate 20 held in position bymeans of a nut or collar 21 threaded upon the end of the bolt 19 andwhich nut or collar 21 co-operates with a shoulder 22 on the bolt 19.,

The plate 20 is spaced for any desired distance below the bolster plate10, and encompassing the bolt 19 is a sleeve or collar .23 upon the topof Which the pins 17 rest.

The collar is of any desired length and is supported by means of a coilspring 24 which encompasses the bolt 19, one end of the spring engagingthe collar 23 and the other end engaging a nut or adjustable collar 25carried by the bolt 19, and by means of which collar 25 the normaltension of the sprlng 24 may be varied.

ncompassing the sleeve or collar23 is another collar 26 which carries anadjustable member 27 adjacent the lower face of the collar. Encompassingthe spring 24 and the bolt 19 is another spring 28, one end of whichengages and rests against the member 27 and the other end engages andrests against the plate 20. The pins 18 engage and rest upon the collar26 and the spring 28 normally tends to hold the collar 26 elevated, andthe collar is adapted to be depressed against the tension of the spring28 in a manner to be hereinafter described. By adjusting the member 27with respect to the collar 26 the normal stress of the spring 28 may bevaried.

During the operation of the ress when the member 13 descends the blankoldin-gmeans 16 is depressed against the stress of the spring 28 throughthe medium of the pins 18 during one portion of the operation of thepress, and during another portion of the operation of the press, theblank holding means 15 is depressed against the stress ofthe spring 24through the medium of the pins 17.

During a portion of the operation of the machine and while the blank isbeing formed during the shaping of the article over the die 11 and blankholding means 15, it is desirable to lock the blank holding member 15against operation, and this is acromplished in the following manner.

Supported bythe plate 20 is a bracket 29 which depends therebelow. Links3031 are pivotally connected by one extremity as at 32. The free end ofthe link 30 is pivotally connected as at 33 with the bracket 29. Thefree end of the link 31 is pivotally connected as at 34 to a rod 35which passes loosel through the plate '20 and is connecte as at 36' withthe sleeve or collar 23,

a lost motion such as a slot 37 being prefern1aterial has bee-n par'traably provided at the pivot 34 to permitof the proper operation of thelinks.

The links 30 and 31 and rod 35 are of such lengths that when the collar23 is at the limit of its upward movement or in the position shown inFigure l, the pivots 32, 33 and 34 will be in alinement and the collar23 will be locked against movement as will also the. member 15.

The member 15 is locked against operation until apredetermined time inthe cycle of operation of-the press, that is until the completion of theformation of the article over the die 11 and member 15.

Any suitable means may be provided for releasing the locking mechanism,such as a bar or rod 38 which passes loosely through a lug or projection39 carried by the collar 26 and also loosely through the plate 20.

A nut 40 is carried by the rod 38 on one side of the projection 39 and anut 41 is carried by the rod on the other side of the projection 39.

The nut 40 serves as a means for supporting the rod 38 and for raisingthe same to permit the locking mechanism to become active when thecollar 26 is raised by the stress of the spring 28.

Vhen the collar 26 is depressed against the stress of the spring 28 thelug or projection 39 will engage the nut 41 to shift the rod 38downwardly causing the extremity of the rod to engage a pin or plunger42, moving the latter forwardly and into contact with the link 31 on oneside of the pivot 32 so as to knuckle the links 30 and 31 and therebyunlock the blank holding member 14 and permit it, together with thecollar 23 to be lowered against the stress of the spring 24.

The end 43 of the rod 18 and the extreminvention will be clearlyunderstood from the foregoing but briefly stated it is as follows.Assuming the parts to be in the position shown in Figure 1, and when thedie I 13 is lowered the material 14 will be cut by means 16 will thenbel against the stress oft the material is shaped ov {the die 11 anblank holding mean *fter the eomple-. tion of this step in I theprojection 39 on co the nut 41 to force the b'ar or rod 38 downwardlyand the plunger or pin 42 forwardly.

the dies 13 and 12. [The blank holding-- .ered by the die 13.

28 until-tbs shaped and'unti'l ng of the article ar 36 will engage' thelinks 30 and 3i, thereby unlocking the Spring The latter will ngage aelink 31 to knuckle blank holding member 15. 4

A further operation of the die '13 in the same direction will cause theblank holding means to. be-depressed'so that the article may be finishedor shaped over the die. 11

and the blank holding means 15 will then be depressed against the stressof the en the die 13 is withdrawn the collars A 26 and 23 willbe movedupwardly by the eral parts, within the" sco What is claimed'as new is3-. p, 1. A draw press including a plunger a stress of the springs 28and 24. This movementof the collar 23 will straighten the links 30-31with respect to each other through the medium of the rod until thepivots 32, 33 and 34 are brought in alinement --to again lock the blankholding means 15, '1 'Upon the upward movement of the collar .26 thelugor projection 39 will engage the nut'l) to raise the bar or rod 38 soas to permit the pin 'or plunger 42 to be retracted.

" While the preferred form of the invention plurality of separate springcontrolled 3 blank holding means 1 adapted to succes sivelyco-oporatewith -the plunger to clamp the work, and means operable topositively- 'lockone of the blank holding means against operation duringthe operation of theiother blank holding means, the last recited meansincluding a toggle like device and means. operabletov knuckle the saidtoggle device to release the blank holding means locked thereby.

2. A draw press including a plunger,- a

plurality of separate spring controlled I "blank holding means adaptedto .succes sively co-operate with the plunger to clamp the-work, meansoperable to positively lock one 'of the blankholding means againstoperation during the operation of the other 1 blank'holding means, thelast recited means includinga toggle like-device, and means controlledin its operation by the actuation of one of the said blank holding meansfor knuckling the said toggle to release the blank holding means lockedthereby. 3 A draw press including a plunger, a'

' to clamp "holdin plurality of blank holding means adapted I tosuccessively co-operate with the plunger the work, springs individual tothe blank holding means and'against the stress of which springs therespective blank .holding means is operable under the stress of saidplunger, a toggle like construction operatively connected with one ofthe blank holding means for locking the latter against operation duringthe operation of the other blank holding means, and means responsive tothe operation of the said other blank holding means for knuckling thesaid toggle device to release the blank holding means that is lockedthereby.

4. A draw press including a plunger, a plurality of blank holding meansadapted to successively co-operate with the plunger to clamp the work,springs individual to the blank holding means and against the stress ofwhich springs the respective blank operatively' connected with one ofthe blank holdin means for locking the latter against operation duringthe operation of the other blank holdin means, a. plunger operable uponthe sai toggle device for knuckling the latter, and a shifting deviceoperable means is operable under the stress of sai plunger, a .togglelike construction automatically at .a predetermined time in the cycle ofo. eration of the press for actuating the sai plunger.

5. A draw press including a plunger, a,

plurality of blank holding'means adapted to successively co-operate withthe plunger I to clamp the work, springs individual to the blank holdingmeans and against the stress of which springs the res ective blankholdin meansis operable un er the stress of sai plunger, a toggle likeconstruction operatively connected with one of the blank holdin meansfor locking the latter against operation during the operation oftheother blank holding means, a plunger operable upon the said toggledevice for knuckling the latter, a'shifting device" operable at a tionof the press for actuating the said plunger, and means ,for varying atwill the time in the cycle of-operation -ofthe press at which the saidplunger is shifted by the said shifting device.

names to this specification onthis 28th day of November, A. vD. .1924.

RAYMOND slnnvrs. .,FREDRICH J. RODE,

predetermined time in the cycle-of .opera- 3 In testimony whereof wehave signed our I

